Injector



Patented Dec. 22, 1931,

UNITED STATES PATENT OFFICE i FREI; LMARTY; on DETROIT. MICHIGAN, AssIGNoR fro rENBERTIIY INJEOTOR com- PANY, ACORPORATION OF DELAWARE INJEGTOR Application led May23, 1928. Serial N0. 280,097.

This invention relates to injectors and particularly to a novel delivery jet or tube.

y The delivery tube is a tapered tube or jet arranged to `fit the rapidly changing size of jet as caused by condensation and at the outer end of the delivery tube the diiusing section serves to reconvert velocity to pressure with minimumloss of energy.

It is necessary that the delivery jet have openings at proper points to allow the fluid to exhaust through the sides of the jet until such time that thej et has reached a mixture which canl force its way intothe boiler against the boiler pressure.

Heretofore such openings have beenprovided by drilling holes in the sides of thejet or by providing ribs defining spaces in the sides Vof the jet. Experience has proved that this method is unsatisfactoryfor the reason that all iiuid strikes the margins of the holes so as' to quickly wear away the same, thus requiring frequent repair and replacement.

l have overcome the above recited objections `by providing a delivery tube comprisl ing a plurality oftapers with separate sections or parts involving the use of `a separate section or part for every taper.

An object of the invention is to provide an injector delivery tube whereby the spill holes are eliminated.

Another Aobject is to provide a construction having the equivalent of spill holes whereby the excessive wear due to the fluid is eliminated and the usefulness of the injector prolonged over the types now in use.

A further object of the invention is to provide a. delivery jet or tube forV injectors wherein the relief .Openings are providedI by means of endwise spaced sections assembled to provide the complete delivery jet, which sections have tapers therethrough arranged in such manner as to reduce to a minimum the vwear on the sections.

A further object of the invention is'to provide a delivery tube construction for 1njectors which is economical to manufacture `.and easily assembled and repaired.

-through a delivery tube.

The above recited, further and other objects will be apparent from the following de- Y scription, drawings and appended claims. An embodiment of the invention is shown on the accompanying drawings and the views thereof are as follows: j

Figure 1 is a central section through an injector provided with a delivery tube embodying my improvements.`

Figure 2 is an enlarged central section Figure 3 is a section on line III-III of Figure 2. Y In the drawings, an

injector casing 1 has fits inlet end threaded exteriorly at 2 and its outlet end interiorly threaded at 3.

A steam inlet pipe t'is attached to the inlet end of the casing 1 by means of a collar 5 fitting over` a shoulder on the pipe l and in threaded engagement withlthe threaded end of the casing.

A steam cone 6 having a diverging taper 7 in the direction of travel of the fluid is secured in the inlet end of the casing adjacent the inlet pipe 4 in the manner shown.

Y The casingl is provided with a water inlet 8, boiler outlet9 and overflow 10.

The casing has a transverse partition 1l, the same forming a portion of the waterA inlet 8. The partition 11 hasja threaded opening'- 12 through the same. Y .l i j i A cone section 13 is'threaded into the opening 12 through the partition 11. This section has a convergingv taper 14 and is arranged .with its inlet end spaced a slight distancev from the Outlet end of the steam cone 6. The delivery tube comprises, inthe present instance, ahousing casting 15 having a cylindrical body 16 and a reduced end 17 with an'annularabutment 18 about the saine.

There are shown herein two separate parts or sections forming the combining nozzle of the device. These sections are 19 and 20. Section 19 has a threaded portion 21 which is n threaded engagement with the end of the housing 15. An annular abutment 22 is formed about the member 19 so as to make an air-tight connection with the housing 15.

The section or part 19 is provided with a converging taper 23 having a flared or bell mouthed inlet end 24 and a cylindrical portion 25 at the outlet end of the taper. The axial length of this cylindrical portion is slight with relation to the length of the taper 23 through this section.

The second member 2O of the combining nozzle is threaded into a partition 26 formed in the housing 15 and is shown as of smaller diameter than the section 19. This section also has an annular end or abutment 27 to form an air-tight connection with the partition 26. The section 2() has a converging taper 28 and a flared or bell mouthed inlet 29 and at its outlet end, a cylindrical portion 30. The maximum diameter of the converging taper 28 in section 2O is substantially that of the diameter of the cylindrical portion 25 in the first combining section 19. Y

The housing 15 is formed with annular recesses 31 and 32 into which the steam and water pass, as is present practice with injectors having spill holes and is for a purpose well understood in injectors.

The housing 15 has a taper through the same extending from the recess 32 to the outer end of the housing. The taper is variable, there being a short taper 33 and a relatively long diverging taper 34, this taper serving as the diffusing member of the delivery jet. The inlet to the taper 33 is flared or bell mouthed as at 35. The diameter of the taper 33 immediately beyond the bell mouth 35 in the direction of travel of the fluid is substantially that or perhaps may be slightly greater than the diameter of the cylindrical portion 30 of the second combining section 20.

The overflow 10 is formed as a part of the injector casting 1 and comprises a threaded opening 36 into which a piece of pipe may be threaded for overflow purposes. Another opening 37 is formed in the overflow portion of the injector casting and is normally closed by a screw plug 38.

A valve seat 39 formed in the casting and a valve 40 carried by a pivoted arm 41 pivoted at 42 to the casting normally closes against the valve seat 39.

The plug 38 may be removed for the purpose of repair and adjusting the valve 40 and its associated parts.

Steam is admitted through the injector' V through the steam pipe 4 and passes through the steam cone 6 where it pi'cls up l'ater through the water inlet 8.V The fluid, that is,

'the sections.

the steam and water, passes through the taper 14 in the section 13, the outlet end of which taper has a cylindrical portion 41 to form the jet or stream of fluid into a substantially cylindrical shape.

The jet is discharged across the gap between the section 13 and into the inlet end of the rst combining section 19 of the delivery jet, where the diameter of the jet is reduced by means of the taper 23 and at the outlet thereof, the et is formed again into cylindrical shape where it discharges across the gap into the bell mouthed opening 29 of the second combining section 20 of the delivery nozzle. Again the jet is reduced in diameter by the taper 28 and again formed in cylindrical shape where it is discharged across the gap into the bell mouthed opening of the taper 33, and then it enters the diffusing section 34 from which it is forced thru the boiler outlet 9 into the boiler.

Any accumulation of steam and water which occurs at the begining of the operation of the injector passes out through the overflow 10 and continues to so pass until the proper adjustment is reached between the steam and water within the injector, the valve 40 closing the overflow when this point has been reached.

The gaps between the sections 19, 2O and the section containing the tapers 33 and 34 are maintained at a minimum. The tapered bell mouths on the entrance ends of the several sections pick up the streams discharged from the preceding sections with a minimum loss and consequently with minimum friction between the fluid stream and the entering ends of the tapered sections. By forming this jet into cylindrical form immediately preceding its entrance into the succeeding section increases the efficiency of the device and reduces wear to a large extent.

The sections 19 and 20 are easily applied to and removed from the housing 15 as the same are threaded in the housing.

The inlet ends of the several sections of the injector and particularly the delivery tube thereof, instead of being flared, may be made with uniform taper from the entrance end to the cylindrical portion at the outer ends of The tapers constructed in this manner would have the diameters of the same, a slight distance inwardly of the entrance ends of the sections, substantially equal to the diameters of the cylindricalv portions of the preceding sections.

I have shown and described but two sections 19 and 20 which are removable with respect to the housing 15. l do not wish to be understood as limiting myself to this construction, as circumstances might arise whereby the diffusing taper 34 and intermediate taper 33 could be formed in separate sections, and these sections as well as 19 and 2O assembled in operative relation in a housing similar to housing 15.

The delivery nozzle herein described is suitable for use in large injectors such as are v It will be observed that the delivery jet is j made up or" a housing with several sections or parts arranged in the housing to allow independent installation of the sections for every taper used in the housing. j

lVinile I have described more or less precisely the details of construction of my invention, yet I do not wish to be understood as limiting myself thereto as I am aware that changes may be made ina proportion and arrangement of parts and that equivalents may be substituted, all without departing from the spirit and scope of myV invention.

I claim as my invention:

l. A delivery jet for automatic injectors comprising a casing having a tapered passage through one yend thereof forming the diffusing member of said jet, other jet sections removably mounted in the opposite end of said casing, each having a converging passage therein, said passages being in axial alignment with each other and the passagein the diiusing member, the inlet ends of all of said passages being flared and the outlet ends of said section passages being cylindrical, the maximum diameter of said flared inlets being substantially the same as the diameter of said cylindrical outlets and all of said passages being spaced apart to provide iui-d outlets between said sections, and one of said sections and didusing member.

2. A delivery jet for automatic injectors comprising a casing having a converging diverging passage through the outer end thereof forming the diusing member of the jet,

a partition near the mid part of said casing,

said casing having recesses on opposite sides of said partition, .a jet section removably positioned in said partition and having a converging passage therein in alignment with said first named passage but spaced therefrom, another jet section in the inner end of the casing having a converging passage spaced Jfrom the passage in said iirst named jet section but in alignment therewith and the passage forming said diffusing member, the inlet ends of all of said passages being substantially equal inv diameter to the outlet end of a preceding passage and the spacing of said passages providing iuid outiets discharging into said recesses.

In testimony whereof I have hereunto subscribed my name at Detroit, Wayne County, Michigan.

' FRED Je MARTY. 

